This app icon looks like a stylized A next to Sign on a purple background. This will allow you to add your signature to the PDFSelect Create Signature. If you choose the option where only your signature is Adobe Fill & Sign is an intuitive, easy-to-use platform suited to every situation. You'll need a subscription to use this service, which offers more secure e-signatures (like certificate-based digital signatures) Tap Fill & Sign. Acrobat Sign mobile app is a free app for Android or iOS device